Photoshop / enlarge canvas - DPChallenge Forums

05/23/2003 06:59:59 PM · #1

I have a picture that have the 3/2 rati and I would like to increase the canvas just have a black large border with the title for posting on DPC print.
My questions is : how do I enlarge the canvas and keeping the same ratio ? I did not see anything except doing the calculation myself.
Thank you guys !
PS : I will be very happy when I will finally have one photo on PDCprint that has the right border and dpi and so and so !

joanns

Fujifilm FinePix S5 Pro

05/23/2003 07:35:22 PM · #2

Hi, increase both width & height by the same percentage. That will keep your desired aspect ratio intact.

Message edited by author 2003-05-23 19:44:23.

05/23/2003 08:00:20 PM · #3

But I have to calculate it right ?
photoshop is asking an exact size for both dimentions.
When increasing the size of the iamge itself, it keeps the ration

Paige

Canon EOS-350D Rebel XT

05/23/2003 08:20:31 PM · #4

Not sure if I am understanding your question but, are you going to image

05/23/2003 08:25:20 PM · #5

yes it's what I mean, but then I am losing the ratio right ?
I need to have the exact ration for the print.

krets

Sony DSC-F707

05/23/2003 10:22:29 PM · #6

How big is your border?

I'd probably go into Image size first and adjust one of the dimensions for the border I wanted. PS will adjust the other dimension accordingly to keep the same aspect ratio.

Take those numbers and do the adjustment on the canvas size yourself.

Paige

Canon EOS-350D Rebel XT

05/23/2003 10:36:32 PM · #7

Originally posted by lionelm:

yes it's what I mean, but then I am losing the ratio right ?
I need to have the exact ration for the print.

Yes, adding pixels onto the sides does just that, it does not shrink the photo to keep the measurement the same, although I do think there is a way to do this, but then you are compressing your shot which makes it loose quality. So I guess you'll have to get the ole pencil and paper out :) good luck.
Maybe a photoshop guru will chime in with a special trick.

Paige

Canon EOS-350D Rebel XT

05/23/2003 10:54:48 PM · #8

Or are you talking about proportion? If you add 20 pixels width and height then your porportion/ratio stays the same.
example:
If you work in pixels and you want a final print to be say 100x120 pixels with a 20x20pixel border then what I would do is resize my image to 80x100 pixels then go to canvas and add 20 pixels to width and height to make a final print that is 100x120pixels. For me working in pixels is the easiest, maybe I am way off in understanding your question and I am sure there are a million ways to doing this, but I hope it helps.

Fujifilm XF 55-200mm f/3.5-4.8 R LM OIS

05/24/2003 08:30:26 AM · #9

Paige, what I wanted to do was .. let's say I have a 300/200 picture with 1.5 ratio. And I want to add a border to that without loosing the ration and without cropping the photo. Then I cannot add 40 pix in each dimension, I would lose the ratio.

So probably we have to calculate that and Krets method is probably the best one.

Thanks for you help guys

Lionel

joanns

Fujifilm FinePix S5 Pro

05/24/2003 02:28:44 PM · #10

Originally posted by lionelm:

But I have to calculate it right ?
photoshop is asking an exact size for both dimentions.
When increasing the size of the iamge itself, it keeps the ration

Hi Lionel. I put together a quick tutorial. Please let me know if you have any questions. Add border and keep aspect ratio

joanns

Fujifilm FinePix S5 Pro

05/24/2003 04:50:58 PM · #11

OOps, I put the images in the wrong Web folder. The page is fixed now.
working page

ursula

Fujifilm X-T2

05/24/2003 06:21:47 PM · #12

Another way to do this, in particular if you want to keep the border the same number of pixels all the way around, is to

(1) Add the number of pixels you want for the border to the longest side of your photo (e.g., if the picture is 600 x 400, and you want a border 15 pixels wide all around, add 600 + 15 + 15 = 630).

(2) Then divide the resulting number by the proportion number or ratio (sorry, I don't know math terms). In this case, it would be 630 / 1.5 = 420. That's the number of pixels for the shorter side of your picture with the 15 pixel border included. Does that make sense so far?

(3) So next you need to take this new number (420 in this case) and deduct the pixels for border (420 - 15 - 15 = 390). Your picture will have to be 600 x 390 to add a 15 pixel border all around and keep the 1:1.5 proportion.

(4) You then need to crop you original 600 x 400 picture to a 600 x 390 picture, add the 15 pixels border all around, and you have a picture in the right proportions.

Of course, you have to crop the picture, which you don't in Joanns method, but the upside is that the border is equal all around.

Yet another way to do this is to essentially use Joanns method but push the picture upwards within the border, so that you have left, top, and right the same, and bottom margin bigger (or any other arrangement you like).

Hope this makes sense.

ursula

Fujifilm X-T2

Fujifilm XF 55-200mm f/3.5-4.8 R LM OIS

05/24/2003 06:23:51 PM · #13

Disclaimer: I usually don't use Photoshop, only at school (at home I have PaintShop Pro), and your question referred to Photoshop - but the method would be the same.